Borisov O V, Boulakh A B, Zhulina E B
Institute of Macromolecular Compounds of the Russian Academy of Sciences, 199004, St. Petersburg, Russia.
Eur Phys J E Soft Matter. 2003 Dec;12(4):543-51. doi: 10.1140/epje/e2004-00026-3.
The conformation of a weakly dissociating (annealing) polyelectrolyte chain end-tethered to a similarly or oppositely charged planar surface is analyzed in the framework of scaling arguments. For a similarly charged interface an analytical model is also utilized. We demonstrate that at low salt concentration in bulk solution there is a strong coupling between the polyelectrolyte conformation and its degree of ionization. In the case of an oppositely charged (adsorbing) surface, adsorption promotes ionization of the annealing polyelectrolyte. As a result, the adsorbed layer thickness decreases as a function of surface charge density more rapidly for an annealing polyelectrolyte than for a quenched one. In the case of a similarly charged (repulsive) surface the chain ionization is suppressed, and the annealing polyelectrolyte chain is less extended than the quenched one. Moreover, an increase in surface charge density leads to non-monotonous extension of the tethered polyelectrolyte.
在标度论证的框架内，分析了一端拴在带相同电荷或相反电荷的平面表面上的弱解离（退火）聚电解质链的构象。对于带相同电荷的界面，还使用了一个解析模型。我们证明，在本体溶液中低盐浓度下，聚电解质构象与其电离度之间存在强耦合。在带相反电荷（吸附）表面的情况下，吸附促进退火聚电解质的电离。结果，对于退火聚电解质，吸附层厚度随表面电荷密度的变化比淬灭聚电解质更快地减小。在带相同电荷（排斥）表面的情况下，链电离受到抑制，退火聚电解质链比淬灭聚电解质链伸展得少。此外，表面电荷密度的增加导致拴系聚电解质的伸展出现非单调变化。
